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Observers of the Qinghai Lake National Nature Reserve Administration Bureau return from an observation at Hadatan wetland by the Qinghai Lake in northwest China's Qinghai Province, Sept. 24, 2019. A three-day autumn observation around the Qinghai Lake by the observers of the Qinghai Lake National Nature Reserve Administration Bureau has concluded after the last observation at Daotanghe wetland. Observers studied and analyzed the ecological environment conditions of Qinghai Lake through collecting the records of wetlands and birds of about 20 observation spots along the Qinghai Lake. (Xinhua/Zhang Long)

Wang Yanming, an observer of the Qinghai Lake National Nature Reserve Administration Bureau, reads a book about China's wild birds in the interval of observations by the Qinghai Lake in northwest China's Qinghai Province, Sept. 25, 2019. A three-day autumn observation around the Qinghai Lake by the observers of the Qinghai Lake National Nature Reserve Administration Bureau has concluded after the last observation at Daotanghe wetland. Observers studied and analyzed the ecological environment conditions of Qinghai Lake through collecting the records of wetlands and birds of about 20 observation spots along the Qinghai Lake. (Xinhua/Zhang Long)

Jia Jinxiao, an observer of the Qinghai Lake National Nature Reserve Administration Bureau, notes observation records by the Qinghai Lake in northwest China's Qinghai Province, Sept. 23, 2019. A three-day autumn observation around the Qinghai Lake by the observers of the Qinghai Lake National Nature Reserve Administration Bureau has concluded after the last observation at Daotanghe wetland. Observers studied and analyzed the ecological environment conditions of Qinghai Lake through collecting the records of wetlands and birds of about 20 observation spots along the Qinghai Lake. (Xinhua/Zhang Long)

Wang Yanming, an observer of the Qinghai Lake National Nature Reserve Administration Bureau, cures a pigeon during observations by the Qinghai Lake in northwest China's Qinghai Province, Sept. 24, 2019. A three-day autumn observation around the Qinghai Lake by the observers of the Qinghai Lake National Nature Reserve Administration Bureau has concluded after the last observation at Daotanghe wetland. Observers studied and analyzed the ecological environment conditions of Qinghai Lake through collecting the records of wetlands and birds of about 20 observation spots along the Qinghai Lake. (Xinhua/Zhang Long)

Observers of the Qinghai Lake National Nature Reserve Administration Bureau observe by the Qinghai Lake in northwest China's Qinghai Province, Sept. 23, 2019. A three-day autumn observation around the Qinghai Lake by the observers of the Qinghai Lake National Nature Reserve Administration Bureau has concluded after the last observation at Daotanghe wetland. Observers studied and analyzed the ecological environment conditions of Qinghai Lake through collecting the records of wetlands and birds of about 20 observation spots along the Qinghai Lake. (Xinhua/Zhang Long)

Jia Jinxiao, an observer of the Qinghai Lake National Nature Reserve Administration Bureau, notes observation records by the Qinghai Lake in northwest China's Qinghai Province, Sept. 24, 2019. A three-day autumn observation around the Qinghai Lake by the observers of the Qinghai Lake National Nature Reserve Administration Bureau has concluded after the last observation at Daotanghe wetland. Observers studied and analyzed the ecological environment conditions of Qinghai Lake through collecting the records of wetlands and birds of about 20 observation spots along the Qinghai Lake. (Xinhua/Zhang Long)

Qu Yongqiang (R) and Wang Yanming, observers of the Qinghai Lake National Nature Reserve Administration Bureau, observe at the river mouth of Buha river in northwest China's Qinghai Province, Sept. 24, 2019. A three-day autumn observation around the Qinghai Lake by the observers of the Qinghai Lake National Nature Reserve Administration Bureau has concluded after the last observation at Daotanghe wetland. Observers studied and analyzed the ecological environment conditions of Qinghai Lake through collecting the records of wetlands and birds of about 20 observation spots along the Qinghai Lake. (Xinhua/Zhang Long)

Yang Tao, an observer of the Qinghai Lake National Nature Reserve Administration Bureau, observes at an observation spot of Garila Village by the Qinghai Lake in northwest China's Qinghai Province, Sept. 23, 2019. A three-day autumn observation around the Qinghai Lake by the observers of the Qinghai Lake National Nature Reserve Administration Bureau has concluded after the last observation at Daotanghe wetland. Observers studied and analyzed the ecological environment conditions of Qinghai Lake through collecting the records of wetlands and birds of about 20 observation spots along the Qinghai Lake. (Xinhua/Zhang Long)